Port bug fixes and stability improvements from PR #15

- Fix Float32Array embedder bug: was creating zero-filled array instead
  of copying data from TypedArray-like objects
- Fix VSS search query: use subquery pattern so LIMIT applies before JOIN
- Pin tree-sitter versions: remove caret ranges for ABI stability, add
  overrides to lock tree-sitter core at 0.22.4
- Lazy grammar loading: load native bindings on first use per language
  instead of all at startup, so one missing grammar doesn't affect others
- Remove stale src/extraction/queries copy from copy-assets script

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/vectors/embedder.ts

@@ -296,7 +296,7 @@ export class TextEmbedder {
     if (data && typeof data === 'object' && 'length' in data) {
       // Handle TypedArray-like objects
       const arr = data as ArrayLike<number>;
-      return new Float32Array(arr.length);
+      return Float32Array.from(Array.from(arr));
     }
     throw new Error('Unsupported data format for embedding');
   }

src/vectors/search.ts

@@ -324,13 +324,14 @@ export class VectorSearchManager {
       const rows = this.db
         .prepare(
           `
-          SELECT
-            vss_map.node_id,
-            vss_vectors.distance
-          FROM vss_vectors
-          JOIN vss_map ON vss_map.rowid = vss_vectors.rowid
-          WHERE vss_search(vss_vectors.embedding, ?)
-          LIMIT ${safeLimit}
+          SELECT m.node_id, v.distance
+          FROM (
+            SELECT rowid, distance
+            FROM vss_vectors
+            WHERE vss_search(embedding, ?)
+            LIMIT ${safeLimit}
+          ) v
+          JOIN vss_map m ON m.rowid = v.rowid
         `
         )
         .all(vectorJson) as Array<{ node_id: string; distance: number }>;